Hi Jeff
re: "Based on the r0.5, but they are PCBs of our own design that are modified from r0.5."
Cool! If you'd like, please Email your Eagle design files and BOM to support@sanworks.io. I'll review them, to see if I can spot an issue. Fortunately, this isn't a problem we've had before.
At some point in our first year, we ordered a PCBA job of 30 boards from Shenzhen that shipped with bogus Texas Instruments SN65HVD31DR ICs. When I removed the ICs with hot air and replaced them with ICs I ordered from Digikey, each board worked fine.
-Josh